Wish I'd known that in my single days to be a bit more confident!
Maybe what you are saying about size makes a little sense to me, as some have said they are a bit sore afterwards, but I put that down to time or technique.

As for the adjustable cock ring that would be good, I think I would prefer something with a bit of flex in it though, but thanks for the suggestion.

Just to let you know, most of the adjustable cock rings are made from rubber or silicone, so do have flex to them :)